PHILADELPHIA — Since arriving here, Andrew Bynum has been asked to talk about a host of topics: This season. Next season. His knees. His doctors. His treatment. When he’ll return. If he’ll return. How he’ll feel when he returns.

Tuesday, he didn’t say anything. He didn’t need to, either.

Bynum went through a rigorous workout at PCOM, allowing his play to speak for itself. In what was visible to reporters, the injured center ran for at least 20 minutes on one of the team’s antigravity treadmills, then engaged in a series of strength and conditioning drills before taking shooting practice.

“I’m excited, too. From my standpoint being the coach, I totally agree with what the fans are feeling,” Sixers coach Doug Collins said. “But I can’t do that with our group. We’re trying to find some answers without him so we can win some games.”

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Until the time comes for Bynum to debut with the Sixers — and he intimated Monday that it’ll be post-All-Star break, possibly Feb. 20 at Minnesota ­— he’s relegated to the solitary confinement version of workouts, like Tuesday’s.

Bynum followed up his lengthy treadmill run with agility drills, headed by Sixers trainer Kevin Johnson. Bynum worked on his footwork with a rope ladder sprawled across the floor, stepping in and across the ropes. Then he graduated to strength training, performing lunges with resistance bands strapped around his waist.

Finally, Bynum worked on his shooting. He made strong cuts to the rim, quicker than he’s shown in recent weeks. He tried out his turnaround jumper. He shuffled between spots on the floor, from which he attempted 15-footers.

“He’s getting better,” Collins said. “I asked him, when I was over there working out (beside him). He’s pain free, which is good. You know he hadn’t played in eight months, so with a guy with that size it’s got to be little by little. You can’t just throw him out there and give him a crash course, because it’ll set him back.

“There’s a lot ahead of him here, but he’s moving in the right direction.”

Bynum, for whom the Sixers traded last offseason, hasn’t played at all this season while battling bone bruises in both knees. Though he’s training with the support of a brace on his right knee and a protective sleeve on his left, his range of motion and fluidity are vastly improved.

When Bynum returns, Sixers teammate Evan Turner doesn’t anticipate that he’ll require much in the way of a learning curve.

“Before he got hurt, he was the best big man in the game, so I’m pretty sure when he comes back he’ll probably be if not right away the best big, No. 1 or 2,” Turner said. “I came in the other day and it was 1:30 (p.m.) and he was still shooting. He’ll be ready.”